Notification soundsGeneral

not sure what i'm doing wrong but i'm trying to change my sms alert sound. I go to My device/sound/notifications but on a sms, it simply vibrates and there is no sound. In the volume too, the notifications sound is set to max

All stock app notifications default to the system default, but each app will have its own notification settings. I use a different tone for each so I know what each incoming notification is without needing to look at the phone.

Its only the messaging notifications? If so that is rather odd. I would get Sliding Messaging from the Play Store and see if that works (and also because it has rich notifications and is like a million times better than the stock app).